AU612067B2 - Servo circuit control system - Google Patents

Servo circuit control system

Info

Publication number
AU612067B2
AU612067B2 AU47771/90A AU4777190A AU612067B2 AU 612067 B2 AU612067 B2 AU 612067B2 AU 47771/90 A AU47771/90 A AU 47771/90A AU 4777190 A AU4777190 A AU 4777190A AU 612067 B2 AU612067 B2 AU 612067B2
Authority
AU
Australia
Prior art keywords
control system
circuit control
servo circuit
servo
control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
AU47771/90A
Other languages
English (en)
Other versions
AU4777190A (en
Inventor
Shuichi Hashimoto
Tohru Shinohara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP1003190A external-priority patent/JPH0736127B2/ja
Priority claimed from JP1003188A external-priority patent/JPH0736134B2/ja
Priority claimed from JP1065756A external-priority patent/JP2521808B2/ja
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Publication of AU4777190A publication Critical patent/AU4777190A/en
Application granted granted Critical
Publication of AU612067B2 publication Critical patent/AU612067B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/02—Driving or moving of heads
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
    • G11B7/08529—Methods and circuits to control the velocity of the head as it traverses the tracks
    • G11B7/08535—Methods and circuits to control the velocity of the head as it traverses the tracks to maintain constant velocity during the traverse
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/02—Driving or moving of heads
    • G11B21/08—Track changing or selecting during transducing operation
    • G11B21/081—Access to indexed tracks or parts of continuous track
    • G11B21/083—Access to indexed tracks or parts of continuous track on discs
    • G11B21/085—Access to indexed tracks or parts of continuous track on discs with track following of accessed part
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/54—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head into or out of its operative position or across tracks
    • G11B5/55—Track change, selection or acquisition by displacement of the head
    • G11B5/5521—Track change, selection or acquisition by displacement of the head across disk tracks
    • G11B5/5526—Control therefor; circuits, track configurations or relative disposition of servo-information transducers and servo-information tracks for control thereof
    • G11B5/553—Details
    • G11B5/5547—"Seek" control and circuits therefor
AU47771/90A 1989-01-10 1990-01-05 Servo circuit control system Ceased AU612067B2 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP1003190A JPH0736127B2 (ja) 1989-01-10 1989-01-10 サーボ回路の位置制御切換制御方法
JP1-003190 1989-01-10
JP1-003188 1989-01-10
JP1003188A JPH0736134B2 (ja) 1989-01-10 1989-01-10 サーボ回路の速度制御方法
JP1065756A JP2521808B2 (ja) 1989-03-17 1989-03-17 サ―ボ回路の制御方法
JP1-065756 1989-03-17

Publications (2)

Publication Number Publication Date
AU4777190A AU4777190A (en) 1990-08-02
AU612067B2 true AU612067B2 (en) 1991-06-27

Family

ID=27275697

Family Applications (1)

Application Number Title Priority Date Filing Date
AU47771/90A Ceased AU612067B2 (en) 1989-01-10 1990-01-05 Servo circuit control system

Country Status (5)

Country Link
US (1) US5194798A (ko)
EP (1) EP0378330B1 (ko)
KR (1) KR930008571B1 (ko)
AU (1) AU612067B2 (ko)
DE (1) DE69020366T2 (ko)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU613819B2 (en) * 1989-01-10 1991-08-08 Fujitsu Limited Servo circuit for magnetic disk apparatus

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5566034A (en) * 1994-06-03 1996-10-15 Quantum Corporation Off-track detection with charge redistribution A/D circuits
JP3302235B2 (ja) * 1995-09-29 2002-07-15 三菱電機株式会社 電動機の位置制御装置
US5838515A (en) * 1996-04-30 1998-11-17 Quantum Corporation PWM/linear driver for disk drive voice coil actuator
US6570361B1 (en) * 1999-02-22 2003-05-27 Borealis Technical Limited Rotating induction apparatus
KR100587275B1 (ko) * 1999-01-30 2006-06-08 엘지전자 주식회사 디스크 서치 장치 및 방법

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU4785490A (en) * 1989-01-30 1990-08-09 Fujitsu Limited Servo circuit
AU4777890A (en) * 1989-01-10 1990-08-09 Fujitsu Limited Automatic adjustment system for servo circuit of a magnetic disk apparatus
AU4777590A (en) * 1989-01-10 1990-08-09 Fujitsu Limited Servo circuit for magnetic disk apparatus

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1319227A (en) * 1971-02-15 1973-06-06 Ibm Movement control system
US4096425A (en) * 1974-09-19 1978-06-20 Ferranti Limited Servo systems
US4184108A (en) * 1977-11-23 1980-01-15 Sperry Rand Corporation Self-regulating electronic tachometer
US4237502A (en) * 1979-07-10 1980-12-02 Per Sci, Inc. Disk drive system
US4288731A (en) * 1980-02-22 1981-09-08 Sperry Corporation Average value tachometer for a disc drive servo and the like
US4381526A (en) * 1980-11-10 1983-04-26 Memorex Corporation Velocity control system for a data storage apparatus
JPS57189376A (en) * 1981-05-15 1982-11-20 Toshiba Corp Magnetic disc device
EP0097208B1 (en) * 1982-06-18 1987-03-11 International Business Machines Corporation Head positioning system with automatic gain control
US4518904A (en) * 1984-01-25 1985-05-21 Rodime Plc Stepper motor control for data disk system
US4609855A (en) * 1984-11-09 1986-09-02 Motorola, Inc. Adaptive servomotor control
US4710865A (en) * 1984-11-14 1987-12-01 Canon Kabushiki Kaisha Control system for positioning an object using switching from a speed control mode to a position control mode with adjustable brain
JPS6252771A (ja) * 1985-08-30 1987-03-07 Toshiba Corp 磁気ヘツドの速度検出装置
US4803573A (en) * 1985-10-15 1989-02-07 Fuji Photo Film Co., Ltd. Track access apparatus having high-speed random access using a single stepping motor in a magnetic recording/playback system
US4697127A (en) * 1986-06-09 1987-09-29 International Business Machines Corporation Adaptive control technique for a dynamic system
JPH0810542B2 (ja) * 1987-06-06 1996-01-31 富士通株式会社 磁気ディスク装置のトラックアクセス制御方式
JP2672574B2 (ja) * 1988-05-31 1997-11-05 株式会社東芝 情報記録再生装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU4777890A (en) * 1989-01-10 1990-08-09 Fujitsu Limited Automatic adjustment system for servo circuit of a magnetic disk apparatus
AU4777590A (en) * 1989-01-10 1990-08-09 Fujitsu Limited Servo circuit for magnetic disk apparatus
AU4785490A (en) * 1989-01-30 1990-08-09 Fujitsu Limited Servo circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU613819B2 (en) * 1989-01-10 1991-08-08 Fujitsu Limited Servo circuit for magnetic disk apparatus
AU641823B2 (en) * 1989-01-10 1993-09-30 Fujitsu Limited Servo circuit for magnetic disk apparatus

Also Published As

Publication number Publication date
US5194798A (en) 1993-03-16
DE69020366D1 (de) 1995-08-03
EP0378330A3 (en) 1991-08-14
EP0378330B1 (en) 1995-06-28
DE69020366T2 (de) 1995-11-16
EP0378330A2 (en) 1990-07-18
KR900012253A (ko) 1990-08-03
AU4777190A (en) 1990-08-02
KR930008571B1 (ko) 1993-09-09

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